Antenna system for radio receiving sets



Sept. 23, 1941. E. HAUSYER 2,256,803

ANTENNA SYSTEM FOR RADIO RECEIVING SETS Filed Aug. 1'7, 1939 IN VENTOR.

V ERIC Hausa)? BY W E ATTORNEY.

Patented Sept. 23, 1941 i f'i gg.

Flt:

2,256,803 I ANTENNA SYSTEM g os more RECEIVING 1 Claim.

This invention relates to new and useful improvements in an antennasystem for radio receiving sets.

The invention particularly proposes the construction of small types ofportable radio receiving sets, for domestic .and export use, which areprovided with a plurality of windings adapted to take the place of anantenna and antenna coil for certain wave bands. Moreover the inventionproposes a novel arrangement whereby the windings may be selectivelyconnected to adapt a particular set for long wave reception, medium wavereception and if desired short wave reception. The invention is quiteflexible in this respect, and two or more windings may be used to makeit possible to use the set for two or more wave bands.

More particularly the invention proposes to arrange a plurality ofwindings about the exterior of the case, or cabinet, or body of theradio, and it is proposed to separate the windings a sufiicient distancefrom each other to prevent absorption of energy from each other.

Still further the invention proposes the use of a multiple pole multiplethrow gang switch by which it is possible to control circuits forselectively connecting the various windings with the antenna terminal ofa radio receiving set, and simultaneously short-circuiting the windingswhich are not connected with the radio receiving set and connecting themwith the ground connection of the antenna system.

Still further the invention proposes a novel arrangement of each of thewindings by which they may be readily engaged upon the case or cabinet,as desired.

7 Still further the invention proposes the construction of an antennasystem for a radio receiving set which is simple and durable and whichmay be manufactured and sold at a reasonable cost.

For further comprehension of the invention, and of the objects andadvantages thereof, reference will be had to the following descriptionand accompanying drawing, and to the appended claim in which the variousnovel features of the invention are more particularly set forth.

In the accompanying drawing forming a material part of this disclosure:

Fig. 1 is a perspective view of a case of a portable radio receiving setwith a plurality of windings mounted thereon in accordance with thisinvention.

Fig. 2 is a fragmentary vertical sectional View taken on the line 2-2 ofFig. 1.

I Fig. 3 is a sectional view similar to Fig. 2 but illustrating amodified construction thereof.

Fig. 4 is a schematic diagram of the antenna system.

Fig. 5 is a perspective view ofa double pole double throw gang switchused in this invention.

The antenna system for a radio receiving set in accordance with thisinvention includes a hollow tubular case it which may form the interiorof a carrying'case for a radio receiving set and which may contain thetubes and various mechanism of the radio receiving set. The antennasystem, in accordance with this invention, is applied upon the case It,and is connected in a novel way with the radio receiving set.

More particularly the antenna system includes .a plurality of windings Hand I2 mounted upon the case, and, each adapted to take the place of anantenna and an antenna coil for a certain wave band. For example thewinding H may be designed for long waves, ranging from one.

thousand to two thousand meters. The winding 12 may be designed formedium waves, ranging from two hundred to five hundred meters. Theinvention as illustrated and described in this specification shows buttwo windings ii and I2, but it should be borne in mind that any numberof windings may be used, to extend to the various wave bands. Forexample five windings may be used for. the live commonly used. Wavebands, such as long Wave, medium wave, short wave, ship to shore wave,etc.

Each of the windings is continuous, starting from one terminal end Ha(for the winding I l) and extending around various turns of thewindings, and terminating at the terminal end Hb. Similarly the windingl2 has a terminal end I20; and a plurality of turns and terminates withthe terminal end iii). The case Ill, in the particular design shown onthe drawing, is formed with cutout areas I i, in one of the side wallsthereof, through which the terminal ends of the windings extend.

Each of the windings, as illustrated on the drawing, is of a certainpreferred design. Each comprises a rigid form l5 of insulation material,of the same shape as the cross sectional shape or the case l0, andadapted to be slipped upon a recessed area It extended inwards from theedge of the case. The winding H has its turn closely wound on the form:5. At several areas there are transverse bands I! engaging transverselyacross the turns of the winding and the form l5 for assisting in holdingthe winding upon the form. Suitable adhesive material, such as wax orother materials, may be used to cover the winding and further assist inholding it in position.

In Fig. 3 a modified construction of winding has been disclosed in whichthe winding is mounted directly upon the outside of the case without theuse of a recess, such as the recess l6. According to this form, a stripof fish paper I8 is extended around the case l0, and the winding I l isclosely wound upon this fish paper and around the case.

A multiple pole multiple throw gang switch is used in conjunction withthe antenna system. In the form of the invention illustrated on thedrawing this switch is of a double pole double throw switch, in thatonly two windings are used. However if more than two windings are usedit would be necessary that the multiple switch have more than twoswitching elements, corresponding numerically in number with the numberof windings used.

This double throw double pole gang switch includes a ground terminal 20and a terminal 2| for connection with the antenna terminal of a radioset. Straddling the ground terminal 20 there are terminals 22 and 23which are adapted to be respectively connected with one of the terminalsof windings. Straddling the terminal 21 there are terminals 24 and 25which are adapted to be connected with the other of the terminals of thewindings. The switch is provided with a movable section 26 carryingconductors 21 and 28. The movable section 26 is connected to a knob 29by which it may be moved. The arrangement is such that the conductor 2!normally connects the terminals 20 and 23, and the conductor 28 normallyconnects the terminals 2| and 24. When the knob 29 is turned the section26 is moved so that the conductor 21 connects the terminals 20 and 22,and the conductor 28 connects the terminals 2| and 25. This may bebetter understood by examining Fig. 4.

In Fig. 4 the winding H is shown connected between the terminals 28 and24. The winding I2 is shown connected between the terminals 20 and 23.The terminal 20 is connected with the ground 3| by a ground condenser30. The terminal 2| is connected with a lead 32 adapted to connect withthe antenna terminal of a radio receiving set schematically indicated onthe drawing by showing a portion thereof mainly the first tube 33 andthe tuning condenser 34. It should be understood that the radioreceiving set has not been completely illustrated since it forms no partof the invention and its construction will be readily apparent to thoseskilled in the art.

The operation of the device is as follows:

In one position of the double pole double throw gang switch, theposition illustrated in Fig. 4, the antenna winding 12 is connected withthe terminal lead 32 of the radio receiving set. Thus the antenna systemis functioning. At the same time the antenna winding II isshort-circuited. When the multiple switch is thrown into its otherposition the winding l2 will be disconnected from the antenna terminalof the radio receiving set and short-circuited. Simultaneously theshort-circuit of the winding II will be disconnected and the winding II'will be connected with the antenna terminal of the radio receiving set.

It is an important feature of this invention that the windings H and I2be satisfactorily separated from each other as particularly shown inFig. 1 so that the winding or windings not being used, does notinterfere with the winding in use. It is important that the winding orwindings which are not in use be short-circuited, as previouslydescribed, otherwise there will be an absorption of energy which isundesirable.

While I have illustrated and described the preferred embodiments of myinvention, it is to be understood that I do not limit myself to theprecise constructions herein disclosed and the right is reserved to allchanges and modifications coming within the scope of the invention asdefined in the appended claim.

Having thus described my invention, what I claim as new and desire tosecure by United States Letters Patent is:

In an antenna system for a radio receiving set having a pair of windingsadapted to take the place of an antenna and antenna coil for two wavebands and being sufiiciently spaced to prevent absorption of energy fromeach other, a lead for connection with a ground provided with a groundcondenser, another lead for connection with the antenna terminal of aradio receiving set, a double throw double pole gang switch having twomovable contacts mounted together to move as a unit and two stationarypoles for each movable contact and having one of its movable contactsconnected with said first named lead and having the other of its movablecontacts connected with said second named lead, a circuit connecting oneof said windings With one of said movable contacts and with one pole ofeach group of said two stationary poles, and another circuit connectingthe other of said windings with the said one of said movable contactsand with the remainder of said stationary poles, and said movablecontacts being normally in positions in which one of said windings isshort circuited on said first named lead and the other winding isconnected with the second named lead.

ERIC HAUSER.

